How To Fix CN389 - Actual costs and/or actual revenues exist: Object class cannot be changed

CN389 - Overview

• Message type: E = Error

• Message class: CN - Meldungen für Netzpläne

• Message number: 389

• Message text: Actual costs and/or actual revenues exist: Object class cannot be changed

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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CN389 - Details

• The SAP error message CN389 indicates that there are actual costs and/or actual revenues associated with a particular object, and as a result, the object class cannot be changed. This typically occurs in the context of controlling (CO) and project systems (PS) within SAP, where object classes are used to categorize cost objects.
  
  Cause:
  
  Actual Costs/Revenues Exist: The primary reason for this error is that there are already posted actual costs or revenues against the cost object (e.g., internal order, project, etc.). When actual postings exist, the system prevents changes to the object class to maintain data integrity and consistency.
  Object Class Restrictions: Certain object classes may have specific rules or restrictions that prevent changes once actual postings have been made.
  
  
  Solution:
  To resolve this error, you can consider the following approaches:
  
  
  Review Actual Postings: Check the actual costs and revenues associated with the object. You can do this by using transaction codes like KOB1 (for